If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
6*(7*a+4) = 276 // - 276
6*(7*a+4)-276 = 0
6*(7*a+4)-276 = 0
42*a-252 = 0
42*a-252 = 0
42*a-252 = 0 // + 252
42*a = 252 // : 42
a = 252/42
a = 6
a = 6
| 2(-3k-6)=24 | | 5(-1+1b)=20 | | 1/2(-12m+38) | | -6(x-1)=2(x-5) | | 6(1d+4)=-36 | | 6(2+4a)=-132 | | 2(5m+6)=42 | | 4(-4+7w)=96 | | 3(-3b+3)=9 | | -(x+1)=2(x-20) | | 4(2+5b)=128 | | 3(4+4x)=72 | | 3(1d+10)=42 | | 5(6-3a)=30 | | 5(5-3k)=40 | | 7(1x+9)=147 | | 3(8+b)=3 | | y=2x+11 | | 6(1a+10)=30 | | 5(3m-6)=-90 | | 6(x+2)=3(x-6) | | 3(7w-5)=-183 | | 2(3b+7)=38 | | 7(5b+4)=-287 | | 7(5n-5)=-105 | | 0=2x^2-5x+12 | | 5c+6c=10c | | -4(x-1)=5(x+8) | | 7(-1+4x)=301 | | 5(-10+3m)=40 | | 2(5x-8)=34 | | 4(1n-8)=-16 |